1820115425651 has 4 divisors (see below), whose sum is σ = 1824867685632. Its totient is φ = 1815363165672.

The previous prime is 1820115425567. The next prime is 1820115425669. The reversal of 1820115425651 is 1565245110281.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1820115425651 - 2¹⁴ = 1820115409267 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1820115425599 and 1820115425608.

It is not an unprimeable number, because it can be changed into a prime (1820115425671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2376129416 + ... + 2376130181.

It is an arithmetic number, because the mean of its divisors is an integer number (456216921408).

Almost surely, 2^{1820115425651} is an apocalyptic number.

1820115425651 is a deficient number, since it is larger than the sum of its proper divisors (4752259981).

1820115425651 is an equidigital number, since it uses as much as digits as its factorization.

1820115425651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4752259980.

The product of its (nonzero) digits is 96000, while the sum is 41.

The spelling of 1820115425651 in words is "one trillion, eight hundred twenty billion, one hundred fifteen million, four hundred twenty-five thousand, six hundred fifty-one".